DRB Seattle on thu 20 nov 08
Taylor
Shouldn't "mit ein pin tool in stecken!" be "mit ein pin tool ingestucken!"=
?
re RR- " How is this related or different than bloating?" Blebs are smaller=
than bloats.
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 "Is this caused by materials out-gassing =
when clay is protoplastic?" I think this is so.=A0 In Seattle we have tons =
of bloated bricks. To the extent that they became a style.=A0 My favorite i=
s a chimney where the mason chose to have the meltiest bricks at the base s=
o that it looks like the it's melting into the ground.=A0 The common explai=
nation is that over-reduction in primitve kilns changed Fe2O3 to FeO, the b=
ricks vitrified early, the lack of O2 kept organics from oxidizing, so when=
they broke down they formed bubbles in the gooey bricks.
DRB
--- On Thu, 11/13/08, Taylor Hendrix wrote:
From: Taylor Hendrix
Subject: Re: over firing/blebbing
To: CLAYART@LSV.CERAMICS.ORG
Date: Thursday, November 13, 2008, 9:58 AM
Bill:
I have not heard this in pottery before either but judging by the
word's other uses, I would say that blebbing is caused by air pockets
which remain in the clay after the forming of the piece. Not sure how
this relates to a sign of overfiring.
A quick google check dug up an About.com page with the pottery usage.
I have no idea from where the source of this particular definition
comes. so grain of salt and all.
As my professor Dr. Eselschlager used to say, "If you have a blebben
problem, mit ein pin tool in stecken!" Some days he was more grumpy
than normal.
Taylor, in Rockport TX
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On Thu, Nov 13, 2008 at 7:23 AM, William & Susan Schran User
wrote:
> On 11/12/08 4:33 PM, "Ron Roy"
wrote:
>
>> The first obvious sign that you are over firing a clay is called
blebbing -
>> small blisters all over the ware.
> Ron,
> Have not heard this expression previously.
> How is this related or different than bloating?
> Is this caused by materials out-gassing when clay is protoplastic?
>
> I would think in this instance the problem is caused, not specifically
form
> taking the clay to ^10, but the work heat resulting from extended
> temperature holds at around 2000F.
>
> Bill
>
> --
> William "Bill" Schran
> wschran@cox.net
> wschran@nvcc.edu
> http://www.creativecreekartisans.com
>
=0A=0A=0A
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